[W126 Coupe] check engine light is on

[Dick Spellman]

Gary,

Your 91 should have a diagnostic outlet up near the battery.  A little 
rectangular cover.  Lift this and see if there is a button and LED.

Procedure is something like ign switch on, press the button for 3 
seconds and then count the flashes.   Typically higher digit followed by 
long pause and then lower digits.  It may offer up one or more codes and 
then repeat once again.   To kill the memory I think you just hold the 
button for 10 seconds and release.  If it reappears you know the problem 
persists.

If no button/led,  you need to make one and set in the correct sockets 
and depress.

-\Dick

On 8/15/2011 5:26 PM, Gary wrote:

> any thoughts   1991 560 sec 140k miles

> in the past 2 months i've done some work i.e.

> new fuel pumps

> fuel accumulator

> fuel filter

> fuel pressure regulator

> fuel injectors with seals

> spark plug wires beru

> spark plugs ngk

> cap and rotor

> can't imagine any of these setting off the engine light.  someone told 

> me to check the O2 sensor but i don't know how.  don't know how to use 

> a meter.  the thing is i replaced the sensor about 1 year ago along 

> with the fuel distributor.

> could the sensor go out?

> what else could it be?

> thanks for the help


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